/Engine/Source/Runtime/Online/Voice/Public/Interfaces/VoiceCodec.h
Encode a raw audio stream (expects 16bit PCM audio)
number of bytes at the end of the stream that wasn't encoded (some interfaces can only encode at a certain frame slice)
int32 Encode ( const uint8 * RawPCMData, uint32 RawDataSize, uint8 * OutCompressedData, uint32 & OutCompressedDataSize )